v0.2.2

Memoization v0.2.2

Diff since v0.2.1

Merged pull requests:

• fix all-underscore (#32) (@marius311)

Closed issues:

• MethodError: objects of type (...) are not callable (#27)
• Memoization and include(...) (#29)
• Memoization of SymPy function calls does not recognize identical arguments (#30)
• @memoize cannot handle underscore variables (#31)